Children sleep with their mouths open. What's going on?

Children open their mouths to sleep in their daily lives. The most common reason is due to nasal congestion. There are many reasons for nasal congestion. For example, children show tonsillitis, or suffer from allergic rhinitis, sinusitis, common cold, bronchitis or pneumonia. They will show symptoms of nasal congestion, which will cause poor nasal ventilation, so they will show the phenomenon of mouth breathing. There are also children who are due to increased nasal discharge during sleep, resulting in poor nasal ventilation, but also show the phenomenon of mouth breathing. If the child during this period shows sneezing, body fever, cough expectoration and other performance, need to go to the regular hospital pediatric registration, find out the cause to give scientific and standardized treatment.